| 释义 |
▪ I. spanned, ppl. a.|spænd|
[f. span v.1 and v.2]
That is or has been spanned or drawn tight.
1597A. M. tr. Guillemeau's Fr. Chirurg. 24/1 The tunge being hindred by a certayne ligament which we call the spanned vayne. 1741Richardson Pamela I. Introd. p. xxvi, He made a too tight-laced Objection, where he quarrels with the spann'd Waist of Pamela.
▪ II. spanned, a. Biol.|spænd|
[f. span n.1 + -ed2.]
Of a culture of cells or micro-organisms: having a restricted lifespan; unable to propagate asexually without limit.
1968Exper. Cell Res. XLIX. 116 To produce ‘spanned’ amoebae the nutritional state of amoebae must be altered for a protracted period. 1971J. Z. Young Introd. Study Man xxii. 293 Transfer of a normal nucleus into spanned cytoplasm produced resumed logarithmic growth, and a spanned nucleus in normal cytoplasm produced the spanned condition. 1973Nature 22 June 444/1 The switch from a ‘spanned’ culture to one that is ‘immortal’ does not necessarily signify a qualitative change in other cellular properties. |